Magnetically frustrated behavior in multiferroics R Mn2 O 5 (R=Bi, Eu, and Dy): A Raman scattering study

A. F. García-Flores, E. Granado, H. Martinho, C. Rettori, E. I. Golovenchits, V. A. Sanina, S. B. Oseroff, S. Park, Sang-Wook Cheong

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Abstract

A temperature dependent Raman scattering study in multiferroic single crystals R Mn2 O5 (R=Bi, Eu, and Dy) was performed. The Raman spectra were measured in the range from 150 to 450 cm-1 involving mostly Mn-O-Mn bending vibrations, complementing our previous work in a higher frequency range involving Mn-O stretching modes. A number of studied phonons present anomalous frequency behavior below a characteristic temperature, T* ∼60-65 K, such as that found for the stretching modes. The sign and magnitude of such anomalous behavior appear to be correlated with the ionic radius of R, being softening for R=Bi and hardening for R=Eu and Dy in the range between TC TN and T*. The anomalous phonon behaviors in both bending and stretching modes are consistent with an interpretation in terms of the spin-phonon coupling in a scenario of strong magnetic correlations.

Original languageEnglish (US)
Article number09M106
JournalJournal of Applied Physics
Volume101
Issue number9
DOIs
StatePublished - 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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